Silver alloy.



UNTTE STATES PATENT CEETCE.

SILVER ALLOY.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application filed April 6, 1905. Serial No. 254,197.

To all whom 'lnay concern:

Be it known that I, ARTHUR E. HOBSON, a citizen of the United States, and a resident of Meriden, in the county of New Haven and State of Connecticut, have invented and produced an Improvement in Silver Alloys, of which the following is a specification.

My invention relates to a composition of matter for the production of a silver alloy; and the object of my invention is to provide a composition of matter that shall result in a silver alloy having decided advantages over the alloys in use at the present time.

In producing sterling silver at the present time a composition of matter consisting of nine hundred and twenty-five one-thousandths of silver and seventy-five one-thousandths of copper or brass is used, the sterling silver being always nine hundred and twenty-five onethousandths fine. The other seventyfive one-thousandths may be composed of copper or of brass or of these two metals in different proportions.

' I have found by extended experiment that an alloy in which manganese is used possesses many advantages over the alloy consisting of silver, brass, and copper as at present obtained.

\Vhile the best results are obtained by an alloy composed of silver and manganese only, yet it is possible that good results may be obtained by a composition composed of silver and manganese with copper or brass, or both. I find the best results to accrue from a composition in which is contained silver to the amount of nine hundred and twenty-five onethousandths and manganese to the amount of seventy five one thousandths An alloy produced from such a composition is much more ductile than the old alloys and can be much more readily worked and formed to shape, as by stamping or spinning, and without annealing, or at least with much less annealing than has heretofore been required with the old alloy.

The new composition is entirely free'from fire-scale and Will withstand a much greater amount of heat than the old alloy.

What I claim as my invention, and desire t secure by Letters Patent, is

1. A silver alloy including in its composition silver to the amount of at least nine hundred and twenty-five one-thousandths and the balance of other metals including manganese.

2. A metal alloy consisting of nine hundred and twenty-five parts silver and seventy-five parts of other metals, including manganese.

3. A metal alloy composed of silver nine hundred and twenty-five parts and manganese seventy-five parts.

ARTHUR E. HOBSON.

Witnesses:

JOHN L. DALGLEISH, SUSIE JACKSON. 

